We have used data from the first three years of the CGRO
mission to assemble a broad-band \gamma-ray spectrum of
the galactic black hole candidate Cygnus X-1.
Contemporaneous data from the COMPTEL, OSSE and BATSE
experiments on CGRO have been further selected on the basis
of the hard X-ray flux measured by BATSE. The resulting
spectrum provides a consistent picture of the emission in
the low energy \gamma-ray range above 100 keV. There is
clear evidence for emission out to at least 2 MeV and
perhaps as high as 5 MeV. Comparison with standard
Comptonization models shows evidence for substantial
hardening of the spectrum at energies above a few hundred
keV. The level of spectral hardening seen in these data is
well below that previously reported from some earlier
satellite and balloon experiments, but is nonetheless very
significant. Given the high sensitivity of the COMPTEL data
in the MeV range, this spectrum will provide a useful
comparison for the various models of the high energy
emission that seek to explain the deviations from the
standard Comptonization models.

If the author provided an email address or URL for general inquiries,
it is as follows: